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The Ronald Reagan Carrier Strike Group and South Korean navy ships steam in formation during an exercise Tuesday, Oct. 27, 2015, in international waters to the east of the Korean Peninsula. Two Russian aircraft flew within one nautical mile at a height of 500 feet, prompting the carrier to launch four fighter jets in response. The Russian aircraft left without further incident. (Nathan Burke/U.S. Navy)

YOKOSUKA NAVAL BASE, Japan — The USS Ronald Reagan scrambled its fighter jets earlier this week after two Russian naval reconnaissance aircraft flew within one nautical mile of the U.S. aircraft carrier as it sailed in international waters east of the Korean Peninsula, according to 7th Fleet officials.

In the latest in a series of incidents involving Russian aircraft, two Tupolev Tu-142 Bear aircraft flew as low as 500 feet Tuesday morning near the Reagan, which has been conducting scheduled maneuvers with South Korean navy ships. Four F/A-18 Super Hornets took off from the Reagan’s flight deck in response to the Russian advance, 7th Fleet spokeswoman Lt. Lauren Cole said Thursday.

U.S. officials attempted to contact the Russian aircraft but received no radio response. A U.S. ship escorting the Ronald Reagan followed the Russian aircraft as they withdrew, Navy officials said.

Press officials at the Russian Embassy in Seoul were not immediately available for comment Thursday.

On multiple occasions in the past year, Russian aircraft have tested international boundaries by either violating other countries’ airspace or engaging in what Pentagon officials have called “provocative” actions toward U.S. and NATO ships.

U.S. Navy officials say they have no objection to Russia, or any other nation, flying or sailing wherever international law allows.

“We are advocates of any country being able to operate within international norms,” Cole said. “We do caveat that with the fact that all of these operations need to be conducted in accordance with the rights and regulations of other countries, and within a safe manner.”

The Reagan is essentially a floating airport, complete with an air traffic control center that tracks and communicates with nearby aircraft. When the carrier engages in flight operations, it institutes a carrier control zone, which extends up to 2,500 feet and within a five-mile radius, according to the Navy’s flight training instruction carrier procedures.

Navy officials did not discuss Thursday whether the carrier was engaged in flight operations when the Russian aircraft approached.

“Even if we don’t have flight operations ongoing, we are still very cognizant of what is going on in the airspace, within a good distance,” Cole said.

The lack of communication by the Russian aircraft also conflicted with general aviation practice. Even commercial airports of any significant size generally expect two-way radio contact when aircraft fly as close as the Russians did, according to international aviation guidelines.